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register of cancer cases. a million barefoot doctors in every village in china recorded every cause of death. and then, the chinese, using relatively unsophisticated computer technology made maps of the distribution of cancer. they knew where concentrations of cancer victims were located, but not why. why was there more stomach cancer in certain parts of the country... more liver cancer in others? that was what dr. henderson was asked to find out. dr. henderson: there was a friend of mine working in taiwan at the time who published an elegant study showing that hepatitis b virus looked like a common explanation in taiwan for liver cancer. so we did studies with them, collected blood from about 10,000 people, tested the blood back here in the united states, and followed them and demonstrated that the same virus was causing liver cancer in china. and from that evolved a series of national vaccination programs. it's just such breakthroughs that have intensified data collection efforts around the world. dr. bernstein: we collect information on the type of tumor and all of the characteri
community effort. the chinese did that in southern china. many places around the world have had malaria problems-- brazil-- that they've brought under control. not so in africa. eradication efforts are erratic. yellow fever is another mosquito-transmitted virus that the french encountered when they occupied west africa. so the way the french dealt with this was to conduct an ongoing every-four-year campaign to vaccinate every person in every country they occupied. they had groups of doctors and nurses--that's all they did. they just went from village to village on this four year cycle. that way, the most that could happen is you'd have a group of susceptible children, but it would never get very big before you'd be through vaccinating the next time around. that way, they kept yellow fever under control. now, when those countries became independent, there wasn't money for those programs. and i got introduced to yellow fever in africa because, in 1965... some seven or eight years after senegal got its independence, there was a big epidemic of yellow fever, and it was all in children under
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